Brier booked her place after winning the Welsh 200m senior title last weekend and has been included in the 4x100m relay squad alongside fellow Commonwealth Games debutants Rachel Johncock, Mica Moore, Hannah Thomas and Lucy Evans.

The teenager was told by Welsh Athletics boss Scott Simpson of her selection the night before her history exam and today’s news has been confirmed on the day of her penultimate GCSE which is a Welsh language test.

“I have had to keep the selection secret, which has been very difficult because my friends have been trying to guess,” said Hannah.

“It is still sinking in to be honest and I can’t believe it.

“The Commonwealth Games was in my mind but never a major target.

“Scott phoned quite late and I had an exam the next day.

“My mum didn’t know whether she should tell me or not.

“In the end I was a bit stressed about my history exam so she told me and it cheered me up big time.

“I am glad I am part of a relay.

“I would be a lot more nervous if I was going there as an individual and the girls are lovely as well.

“Being only 16 also helps in a way because there is no pressure on me.

“I am going to a Games where there are going to be some of the world’s best sprinters.

“I remember watching Delhi and London thinking how amazing it would be and how exciting it would be in that situation.

“Now I will experience that.

“When I was about 12, my hero was Jessica Ennis because she was built up so much and she is short as well like me!

“When you look at sprinters, Olympic champion Shelley Anne Fraser-Pryce is also short but the best in the world.”

Hannah Brier (centre) in the 200m at the Welsh Championships (Image: Glenn Sports)

Brier enhanced her credentials last weekend after she claimed her first Welsh senior 200m title.

The young Swansea Harrier clocked a Commonwealth Games ‘B’ standard of 23.54 in the heat but with an illegal tailwind.

She then ran marginally outside the ‘B’ standard in the final to win gold in 23.63 and is the fastest under-17 in Britain.

“Before the Welsh Champs I was running 11.72 and 23.91 and I just thought this is way off, this is impossible,” she added.

“I really didn’t know what happened on the Welsh Champs day.

“I think the adrenaline took over and I just went for it.”

Hannah explained her rapid rise to the senior ranks.

“I went to quite a sporty primary school called Castell Nedd and one of the teachers, Mrs Stephens, was into sport,” she explained.

“I used to take part in sports days and she told me that I was running very fast for my age and I should go down to Swansea Harriers, just to have a go.

“It was at the Under-13 Welsh Champs where I realised I was quite quick.

“Before I used to get smashed by these big girls but then I won out of nowhere and things have developed quickly since then."

Welsh Athletics national performance coach Scott Simpson insisted he had no qualms about throwing Brier on to the senior stage at a major championships.

“We have been keeping an eye on Hannah for the last couple of seasons,” explained Simpson.

“She broke through at the trials last weekend by winning the 200m at a senior championships and was three hundredths off a legal B standard.

“It’s a great story and she’s going to be a key member of that relay team.

“It’s fantastic to be sending someone of 16 years of age to a Commonwealth Games.

“There was no doubts over her age in terms of the selection but she needs to be looked after very carefully over the next eight weeks of build-up and then during Glasgow.

“There are dangers of someone so young being left on her own and we will make sure she is well protected.

“Her long-term development is the most important thing because she is going to be a star of the future.